Four-point conveying mechanism for seedling-raising tray

Abstract

The present invention discloses a four-point conveying mechanism for a seedling-raising tray, which includes a seedling-raising side frame, a conveying sprocket, a conveying chain, a triangular connecting rod frame, a chain anti-twist guiding device, and a tray anti-overturn guiding device; through points A, B, C, and D of this device, a four-bar mechanism composed of a conveying chain, a support connecting rod, and a tray anti-overturn connecting rod forms a stable four-point conveying mechanism. This four-point vertical conveying method is the core innovation point of the seedling-raising equipment. Among them, the anti-twist pulleys at points A and B move in the vertical anti-twist longitudinal guide rails to balance the torque of the weight of the seedling-raising tray at point C on the conveying chain. The anti-overturn pulleys at point D run in the constraint guide rails with a specific trajectory to ensure the horizontal attitude of the seedling-raising tray and overcome the tilting torque of the seedling-raising tray. This four-point conveying method is used to overall improve the operation stability and reliability of the seedling-raising equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of seedling raising equipment, and particularly relates to a four-point conveying mechanism for a seedling raising tray. Background Art

[0002] The current seedling raising technology has been relatively mature. For example, technologies such as soaking time, seeding rate, specific temperature for seedling emergence, ventilation and hardening time, etc. have been programmed. Most of the current seedling raising houses are in greenhouses. As for three-dimensional seedling raising, most only use multi-layer mechanical frames to place multi-layer seedling raising trays to achieve the purpose of saving space. This method of erecting multi-layer shelves in the greenhouse, although it improves the utilization rate of the area in the greenhouse and greatly increases the seedling raising area under the same greenhouse area, there are also many drawbacks to such a seedling raising method. For example, workers have to climb up and down to place the seedling raising trays. Due to temperature and humidity, the growth of seedlings on the upper and lower layers is unbalanced, so they need to be frequently interchanged, which not only increases the labor intensity, but also the seedlings on the sunny side and the shady side of the greenhouse will grow unbalanced, and it is not conducive to realizing mechanized automatic seedling raising.

[0003] To solve the above technical problems, the prior art with the authorization publication number CN 217790659 U provides an automatic seedling raising device. The seedling raising device includes a three-dimensional growth frame skeleton, a seedling raising tray and a chain. Driven rollers are intermittently rotatably installed in the three-dimensional growth frame skeleton. Driven gears are fixedly installed at both ends of each driven roller. Since the driving gear and the driven gears are both engaged with the chain, the chain is rotated. The chain sequentially passes through the upper driven gear and the lower driven gear by triggering from the driving gear, and a right-angle reversing wheel is installed on the three-dimensional growth frame skeleton and then returns to the driving gear to form a cycle. The rotation of the chain drives the seedling raising tray installed on the chain, so that the position of the seedling raising tray is changed. During the up and down cyclic movement of the automatic seedling raising device, the growth balance requirements of temperature and humidity of rice seedlings can be realized.

[0004] In addition, the authorized announcement number CN 203378331 U in the prior art provides a fully automatic seedling raising and breeding intelligent production line, including a seedling raising house and a circulating seedling raising device in the seedling raising house. The circulating seedling raising device includes a three-dimensional seedling raising side frame, a driving sprocket group, a plurality of upper and lower sprocket groups, a first chain, a second chain, a driving device, and seedling tray hanging baskets suspended on the first chain and the second chain. The first chain and the second chain bypass the upper and lower sprocket groups in a W shape between the upper and lower sprocket groups, and the seedling tray hanging baskets on this section of the first and second chains suspended between the adjacent upper and lower sprocket groups are arranged in a staircase step shape up and down. The driving device is controlledly connected to the control device and drives the driving sprocket group to drive the first chain and the second chain to move in a cycle. The seedling raising trays form a multi-layer three-dimensional structure for storage on the seedling tray hanging baskets, and the chains are arranged in a "W" shape, so that the light receiving areas of the seedling raising trays are uniform and do not block each other's light. The seedlings have a balanced growth environment, and the position of the seedling trays can be changed through the chain group.

[0005] The mechanical structures of the above two three-dimensional seedling raising side frames both use a sprocket and chain mechanism to achieve operation. The seedling raising trays are directly hung on the chain links, and all the seedling raising trays are connected in series by the same chain. The seedling raising trays rely on gravity to maintain a horizontal posture. The seedling raising trays move up and down in a cycle with the chain, and the purpose of balanced growth can be achieved. However, this driving method still has the following disadvantages and deficiencies: First, the seedling raising trays need to be hung on the chain links. When the upper and lower adjacent seedling raising trays pass through the sprocket, when one of the seedling raising trays is wound around the sprocket, the distance between it and the other seedling raising tray to be wound is relatively close. Whether interference occurs between the two seedling raising trays is related to the diameter of the sprocket and the width of the seedling raising tray. The width of the seedling raising tray is limited by the distance between the adjacent two chains. To ensure the gap between the seedling raising trays, a sprocket with a larger diameter (sprocket diameter > seedling raising tray width) needs to be used. To avoid interference and collision between adjacent two seedling raising trays during movement, for a 300-mm-wide seedling raising tray, the relative distance between the left and right adjacent seedling raising trays needs to be greater than the width of the seedling raising tray. Therefore, a sprocket with a larger diameter is required, and the cost is correspondingly higher. At the same time, to avoid interference and collision when bypassing the sprocket, the distance between the upper and lower two seedling raising trays also needs to be larger. For a 300-mm-wide seedling raising tray, the distance between the upper and lower adjacent seedling raising trays also needs to be relatively large, about 400 mm, resulting in a low seedling raising density of the seedling raising trays and limited space utilization rate of the three-dimensional seedling raising side frame. Second, the seedling raising trays rely on gravity to maintain a horizontal posture. When the seedling trays on the seedling raising trays are unevenly loaded, the seedling raising trays tilt or may tilt towards one side, and the stability of the trays is poor and they cannot maintain a horizontal posture well. And when the seedling raising trays move up and down, the chain will move accordingly and be affected by the seedling raising trays to vibrate. The vibration of the chain and the perturbation of the seedling raising trays themselves will both cause the possibility of the seedling raising trays tilting, and even cause the seedling raising trays to tilt and twist, increasing the risk of the seedling trays falling off the seedling raising trays. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a four-point conveying mechanism for a seedling-raising tray that is not limited by the diameter of the sprocket and the width of the seedling-raising tray and has stable operation of the seedling-raising tray.

[0007] To solve the above technical problem, the technical solution of the present invention is: a four-point conveying mechanism for a seedling-raising tray, including:

[0008] A seedling-raising side frame, on which a conveying sprocket arranged up and down is installed, a conveying chain is drivingly connected between the two conveying sprockets up and down, and a sprocket driving device is provided on one of the conveying sprockets;

[0009] A plurality of sets of triangular link frames are arranged on the outer circumference of the conveying chain, and the plane where the triangular link frames are located is parallel to the plane where the conveying chain is located; each set of triangular link frames includes two support links, the inner ends of the two support links close to the conveying chain are hinged to the conveying chain at intervals, the outer ends of the two support links far from the conveying chain are correspondingly hinged and connected with a tray hinge shaft, and a tray mounting seat for installing a seedling-raising tray is fixed at one end of the tray hinge shaft;

[0010] A chain anti-twist guiding device is arranged on the vertical conveying section of the conveying chain between the two conveying sprockets up and down, and is correspondingly matched with the inner ends of the two support links close to the conveying chain, and is used to limit the vertical movement of the inner ends of the two support links along the vertical conveying section of the conveying chain to prevent the conveying chain from twisting;

[0011] A tray anti-overturning guiding device includes an anti-overturning link assembly and a constraint guide rail that cooperates with the anti-overturning link assembly. Each tray mounting seat is correspondingly fixed with an anti-overturning link assembly, and all the anti-overturning link assemblies are correspondingly provided with a constraint guide rail. During the conveying process of the seedling-raising tray driven by the conveying chain, all the anti-overturning link assemblies slide along the constraint guide rail to limit the rotational freedom of the tray mounting seat, so that the seedling-raising tray maintains a horizontal posture and avoids overturning.

[0012] As a preferred technical solution, a sprocket adjustment mechanism is provided between the conveying sprocket located below and the corresponding seedling-raising side frame.

[0013] As a preferred technical solution, the sprocket adjusting mechanism includes a sprocket mounting seat fixed on the seedling raising side frame. A plurality of vertically arranged sprocket adjusting chutes are provided on the sprocket mounting seat. The bearing seat of the conveying sprocket is slidably mounted on the sprocket adjusting chute through an adjusting bolt and an adjusting nut. A fixing block is provided on the sprocket mounting seat. A sprocket ejector rod is threadedly mounted on the fixing block. A sprocket adjusting block is fixed on the bearing seat. The bottom end of the sprocket ejector rod abuts against the top end of the sprocket adjusting block.

[0014] As a preferred technical solution, the structures of multiple groups of the triangular link frames are the same, and the lengths of the two support link rods of the same group of the triangular link frames are the same.

[0015] As a preferred technical solution, the anti-twist guiding device for the chain includes two vertically arranged anti-twist longitudinal guide rails. The two anti-twist longitudinal guide rails respectively correspond to two vertical conveying sections of the same conveying chain. The anti-twist longitudinal guide rails are fixed on the seedling raising side frame. The two support link rods are hinged to the links of the conveying chain through link hinge shafts. An anti-twist pulley is installed at the outer end of the link hinge shaft. The anti-twist pulley can slide vertically along the corresponding anti-twist longitudinal guide rail. The top end of the anti-twist longitudinal guide rail is close to the upper conveying sprocket, and the bottom end of the anti-twist longitudinal guide rail is close to the lower conveying sprocket. The top end and the bottom end of the anti-twist longitudinal guide rail are provided with openings that facilitate the anti-twist pulley to pass through.

[0016] As a preferred technical solution, the constraint guide rail is fixed on the seedling raising side frame. The constraint guide rail respectively corresponds to the outer ring of the conveying chain and is eccentrically arranged with the corresponding conveying chain.

[0017] As a preferred technical solution, an installation round hole is provided on the constraint guide rail, and a vertically arranged installation long hole is provided on the seedling raising side frame. The installation round hole and the installation long hole are fixedly installed through bolts. The constraint guide rail is a waist-shaped guide rail. The waist-shaped guide rail includes two vertical conveying guide rails. Arc-shaped conveying guide rails are respectively provided at the top end and the bottom end of the two vertical conveying guide rails. The ends of the vertical conveying guide rails and the arc-shaped conveying guide rails are connected through connecting pieces.

[0018] As a preferred technical solution, the anti-overturning link assembly includes a tray anti-overturning link. One end of the tray anti-overturning link is fixedly connected to the tray mounting seat. An anti-overturning pulley is installed at the other end of the tray anti-overturning link. The anti-overturning pulley slides along the constraint guide rail in a limited manner.

[0019] As a preferred technical solution, the tray mounting seat is horizontally arranged, and the tray anti-overturning link is located below the tray mounting seat and is inclined between the two.

[0020] As a preferred technical solution, the angle between the tray anti-turning connecting rod and the vertical direction is 45°.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0022] 1. Since the C point where the seedling-raising tray is hung is suspended from the outer ring of the conveying chain through two support connecting rods and is far from the position of the conveying chain, at this time, the width of the seedling-raising tray is mainly related to the length of the support connecting rods, and it is less affected by the diameter limit of the conveying sprocket. At this time, a conveying sprocket with a smaller diameter can be selected, and then the support connecting rods are used to increase the distance between the conveying sprocket and the tray mounting seat and the seedling-raising tray. By using the support connecting rods, the size requirement of the conveying sprocket for the width of the seedling-raising tray can be reduced, so as to achieve the purpose of reducing the cost of the conveying sprocket.

[0023] 2. When the seedling-raising tray bypasses the conveying sprocket, the seedling-raising tray is supported outward by the two support connecting rods, and there will be no interference and collision between the upper and lower adjacent seedling-raising trays. At this time, the distance between the upper and lower adjacent seedling-raising trays is no longer affected by the width of the seedling-raising tray, and it is mainly related to the total length of the chain links between the hinge points of the two support connecting rods and the conveying chain (i.e., the length between points A and B). The length between these two hinge points determines the distance between adjacent seedling-raising trays, so that the distance between the seedling-raising trays is no longer limited by the width of the seedling-raising tray itself. The structure of this innovative design method is simple, and the purpose of reducing the equipment cost can be achieved by extending the connecting rod outward; and this design can also be applicable to seedling-raising trays of various different widths, improving the universality of the equipment; at the same time, the distance between the seedling-raising trays can be reduced, so that the seedling-raising density per unit area of this equipment is greatly improved compared with the original structure, and it can effectively improve the space utilization rate of the three-dimensional seedling-raising side frame.

[0024] 3. Through the pulley installation method at points A and B, the anti-twist pulleys at points A and B move vertically along the anti-twist longitudinal guide rail, and the outer circumference of the anti-twist pulley supports on the inner wall of the anti-twist longitudinal guide rail. The supporting force provided by the anti-twist longitudinal guide rail can balance the torque of the weight of the seedling-raising tray at point C on the conveying chain of the vertical conveying section. The anti-twist pulley is restricted by the anti-twist longitudinal guide rail to stably support the conveying chain, preventing the conveying chain from being twisted and undergoing large deformation, so as to achieve the purpose of stable operation of the conveying chain and improve the stability of conveying.

[0025] 4. Since one end of the tray anti-tipping link is fixedly connected to the tray mounting seat, during the movement of the tray mounting seat driven by the conveyor chain, the tray anti-tipping link cooperates with the specific track of the constraint guide rail through the anti-tipping pulley at point D. When the tray anti-tipping link moves along with the tray mounting seat, its own angle never changes, thus restricting the rotational freedom of the tray mounting seat at point C, that is, ensuring the horizontal posture of the seedling-raising tray and reducing the risk of the seedling-raising tray tipping over.

[0026] 5. Through points A, B, C, and D of the present device, a four-bar mechanism composed of a conveyor chain, a support link, and a tray anti-tipping link forms a stable four-point conveying mechanism. This four-point vertical conveying method is the core innovation point of this seedling-raising equipment. Among them, the anti-twist pulleys at points A and B move in the vertical anti-twist longitudinal guide rail to balance the torque of the weight of the seedling-raising tray at point C on the conveyor chain. The anti-tipping pulley at point D runs in the constraint guide rail with a specific track to ensure the horizontal posture of the seedling-raising tray and overcome the tilting torque of the seedling-raising tray. This four-point conveying method is used to overall improve the operation stability and reliability of the seedling-raising equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them:

[0028] Figure 1 is a schematic structural diagram of the four-point conveying mechanism according to an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of the seedling-raising equipment according to an embodiment of the present invention;

[0030] Figure 3 is a partial structural diagram of the seedling-raising equipment according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of the positional relationship of the tray anti-tipping guiding devices on both sides according to an embodiment of the present invention;

[0032] Figure 5 is Figure 4 an enlarged schematic diagram of part A in

[0033] Figure 6 is a schematic diagram of the force analysis of the tray anti-tipping guiding device according to an embodiment of the present invention;

[0034] In the figure: 100 - seedling raising base; 200 - seedling raising side frame; 201 - conveying sprocket; 202 - conveying chain; 203 - wheel drive shaft; 204 - drive motor; 300 - seedling raising tray; 400 - anti - torsion guiding device for chain; 401 - anti - torsion longitudinal guide; 402 - chain link hinge shaft; 403 - anti - torsion pulley; 500 - anti - overturn guiding device for tray; 501 - restraint guide; 502 - anti - overturn connecting rod for tray; 503 - anti - overturn pulley; 600 - top platform; 700 - triangular connecting rod frame; 701 - support connecting rod; 702 - tray hinge shaft; 703 - tray mounting seat. Detailed implementation mode

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present invention are described by way of illustration. It is undoubted that those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not used to limit the protection scope of the claims.

[0036] See Figure 1 As a structural schematic diagram of a four - point conveying mechanism, the seedling raising tray uses a four - point conveying mechanism, including a seedling raising side frame 200, a conveying sprocket 201, a conveying chain 202, a triangular connecting rod frame 700, an anti - torsion guiding device for chain 400, and an anti - overturn guiding device for tray 500. The above structures constitute a four - point conveying mechanism for ensuring the vertical and stable conveying of the seedling raising tray up and down.

[0037] See the installation schematic diagram of the four - point conveying mechanism on the seedling raising equipment Figure 2 , a four - point vertical three - dimensional seedling raising equipment, including a seedling raising base 100, a four - point conveying mechanism, a seedling raising tray 300, and a top platform 600. The four - point conveying mechanism has two groups respectively located on the left and right sides of the seedling raising base. The seedling raising tray is arranged between the four - point conveying mechanisms on the left and right sides, used to drive the vertical and stable conveying of the seedling raising tray up and down. The seedling raising equipment is installed in a seedling raising house. The seedling trays are placed on the seedling raising tray 300 and are driven by the four - point conveying mechanism to perform cyclic conveying in the vertical direction up and down, realizing the growth balance requirements of temperature and humidity for rice seedlings.

[0038] See Figure 2 , the seedling raising base 100 serves as the installation base for the following components, and other devices are directly or indirectly fixed on the seedling raising base 100. The seedling raising base 100 is a rectangular structure, and its four corners are respectively fixed and installed by bolts.

[0039] See Figure 3, the seedling-raising side frames 200 are respectively arranged on both sides of the seedling-raising base 100, and the left and right seedling-raising side frames 200 are arranged oppositely. The bottom ends of the seedling-raising side frames 200 are respectively fixedly installed on the seedling-raising base 100 by bolts. See Figure 1 and Figure 3 , on each seedling-raising side frame 200, a pair of conveying sprockets 201 arranged vertically are installed on the side close to the other. A conveying chain 202 is drivingly connected between the upper and lower conveying sprockets 201 of the same seedling-raising side frame 200. A sprocket drive shaft 203 is fixed between the two opposite conveying sprockets 201 of the two seedling-raising side frames 200. A sprocket driving device is provided on one of the conveying sprockets 201, specifically, a sprocket driving device is provided on the conveying sprocket 201 located below one of the seedling-raising side frames 200. The sprocket driving device includes a driven sprocket fixed on the sprocket drive shaft 203. A driving motor 204 is installed at the bottom end of the seedling-raising side frame 200. A driving sprocket is installed at the output end of the driving motor 204. A transmission chain is connected between the driving sprocket and the driven sprocket.

[0040] See Figure 1 and Figure 3 , a sprocket adjusting mechanism is provided between the two conveying sprockets 201 located below and the corresponding seedling-raising side frame 200. The sprocket adjusting mechanism includes a sprocket mounting seat fixed on the seedling-raising side frame 200. A plurality of vertically arranged sprocket adjusting chutes are provided on the sprocket mounting seat. There are four sprocket adjusting chutes, corresponding to the four corners of the bearing seat of the conveying sprocket 201 respectively. The bearing seat of the conveying sprocket 201 is slidably installed on the sprocket adjusting chute by cooperating an adjusting bolt with an adjusting nut. A fixing block is provided on the sprocket mounting seat. A sprocket ejector rod is threadedly installed on the fixing block. A sprocket adjusting block is fixed on the bearing seat. The bottom end of the sprocket ejector rod abuts against the top end of the sprocket adjusting block. When it is necessary to tighten the conveying chain 202, first loosen each adjusting nut, and then rotate the sprocket ejector rod downward. The bottom end of the sprocket ejector rod forces downward on the sprocket adjusting block, so that the bearing seat of the conveying sprocket 201 moves downward along the sprocket adjusting chute, thereby tightening the conveying chain 202. After the adjustment is completed, tighten each adjusting nut for fixation. Of course, the sprocket adjusting mechanism can also be provided on the conveying sprocket 201 located above. The structure of its sprocket adjusting mechanism is basically the same. The difference is that the sprocket ejector rod forces upward on the sprocket adjusting block. The structural principle is similar and will not be elaborated here.

[0041] See Figure 4 and Figure 5, a plurality of triangular link frames 700 are arranged on the outer circumference of the conveying chain 202, and the plane where the triangular link frames 700 are located is parallel to the plane where the conveying chain 202 is located; each group of the triangular link frames 700 includes two support link rods 701, and the inner ends of the two support link rods 701 close to the conveying chain 202 are hinged to the conveying chain 202 at intervals, and the outer ends of the two support link rods 701 far from the conveying chain 202 are correspondingly hinged and connected with a tray hinge shaft 702, and a tray mounting seat 703 for mounting the seedling tray 300 is fixed at one end of the tray hinge shaft 702 close to the other seedling raising side frame 200; define the hinge point between one of the support link rods 701 and the conveying chain 202 as point A, and the hinge point between the other support link rod 701 and the conveying chain 202 as point B, and define the hinge point between the two support link rods 701 (i.e., the tray hinge shaft 702) as point C to form a triangular stable structure, wherein the tray mounting seat 703 for mounting the seedling tray 300 is hinged at point C. Since the C point for hanging the seedling tray 300 is suspended on the outer ring of the conveying chain 202 through two support link rods 701 and is far from the conveying chain 202, at this time, the width of the seedling tray 300 is mainly related to the length of the support link rod 701 and is less affected by the diameter of the conveying sprocket 201. At this time, a conveying sprocket 201 with a smaller diameter can be selected, and then the support link rod 701 is used to increase the distance between the conveying sprocket 201 and the tray mounting seat 703 and the seedling tray 300, and the support link rod 701 is used to reduce the size requirement of the conveying sprocket 201 for the width of the seedling tray 300, so as to achieve the purpose of reducing the cost of the conveying sprocket 201; in addition, when the seedling tray 300 bypasses the conveying sprocket 201, the seedling tray 300 is supported outward by the two support link rods 701, and there will be no interference and collision between the upper and lower adjacent seedling trays 300. At this time, the distance between the upper and lower adjacent seedling trays 300 is no longer affected by the width of the seedling tray 300, and it is mainly related to the total length of the chain links between the hinge points of the two support link rods 701 and the conveying chain 202 (i.e., the length between points A and B). The length between these two hinge points determines the distance between the adjacent two seedling trays 300, so that the distance between the seedling trays 300 is no longer limited by the width of the seedling tray 300 itself. The structure of this innovative design method is simple, and the use of the link rod to extend outward can achieve the purpose of reducing the equipment cost; and this design can also be applicable to seedling trays 300 with a variety of different widths, improving the universality of the equipment; at the same time, the distance between the seedling trays 300 can be reduced, so that the seedling raising density per unit area of the equipment is greatly improved compared with the original structure, and it can effectively improve the space utilization rate of the three-dimensional seedling raising side frame 200.

[0042] In this device, the two sprockets are arranged vertically, and a chain is used to achieve vertical circular transportation up and down. That is, a single seedling raising device can operate independently as a unit. Of course, multiple sets of seedling raising devices can also be used in parallel. Compared with the prior art in which a long chain is used for serial transportation through several sprockets, this device can be used as an independent unit without affecting other units. If a fault occurs in the chain drive system of a certain device, it will not affect other devices, which can effectively ensure the reliability of the operation of the seedling raising device. It is applicable to various scales of seedling raising, large, medium and small, and its practicability is better.

[0043] In order to reduce the production cost of the seedling raising device and the complexity of device installation, the structures of multiple groups of the triangular link frames 700 are the same. In order to improve the stability of the transportation of the seedling raising trays 300, the lengths of the two support links 701 of the same group of the triangular link frames 700 are the same, which can form a stable triangular structure. In order to improve the space utilization rate of the device and facilitate device installation, the lower support link 701 of the upper group of the triangular link frames 700, the upper support link 701 of the lower group of the triangular link frames 700 are hinged to the same link of the conveying chain 202, and point B of the upper group of the triangular link frames 700 coincides with point A of the lower group of the triangular link frames 700.

[0044] See Figure 2 , the seedling raising trays 300 are used for placing seedling trays, there are multiple ones and they correspond to the number of the triangular link frames 700. The upper centers of both ends of the seedling raising trays 300 are respectively fixed by bolts on the corresponding tray mounting seats 703 between the left and right seedling raising side frames 200. When the sprocket drive device drives the conveying sprocket 201 to rotate, the support link 701, the tray mounting seat 703 hinged to the outer end of the support link 701, and the seedling raising tray 300 mounted on the tray mounting seat 703 move up and down in a vertical circular motion following the conveying chain 202.

[0045] Since the supporting link 701 is used in this device to extend the seedling-raising tray 300 to the outer ring of the conveying chain 202, when there is a load in the seedling-raising tray 300 at point C, the force will be transmitted to the conveying chain 202 through the supporting link 701. The weight of the seedling-raising tray 300 at point C will generate a torque on the conveying chain 202, causing the conveying chain 202 to deform significantly. The conveying chain 202 will vibrate, affecting the stability of the tray operation. To solve this problem in this application, the chain anti-torsion guiding device 400 is designed. Since there is no support at the position corresponding to the vertical conveying section of the conveying chain 202, the conveying chain 202 in the vertical conveying section is prone to torsion and deformation due to the weight of the seedling-raising tray 300. However, the conveying chain 202 wound around the conveying sprocket 201 is supported by the conveying sprocket 201, so the stability of the chain here is better. Therefore, the chain anti-torsion guiding device 400 is only provided for the vertical conveying section of the conveying chain 202. In this embodiment, refer to Figure 1 and Figure 3 , two chain anti-torsion guiding devices 400 are provided, corresponding to the conveying chains 202 on the left and right seedling-raising side frames 200 respectively. They are arranged on the vertical conveying section of the conveying chain 202 between the upper and lower conveying sprockets, and cooperate with the inner ends of the two supporting links 701 close to the conveying chain 202, for restricting the vertical movement of the inner ends of the two supporting links 701 along the vertical conveying section of the conveying chain 202 to prevent the conveying chain 202 from twisting.

[0046] Refer to Figure 1, the chain anti-twist guiding device 400 includes two vertically arranged anti-twist longitudinal guide rails 401, and the two anti-twist longitudinal guide rails 401 respectively correspond to two vertical conveying sections of the same conveying chain 202. The anti-twist longitudinal guide rails 401 are fixed on the seedling raising side frame 200. The two support connecting rods 701 are hinged to the links of the conveying chain 202 through link hinge shafts 402. An anti-twist pulley 403 is installed at the outer end of the link hinge shaft 402, and the anti-twist pulley 403 can slide vertically along the corresponding anti-twist longitudinal guide rail 401. That is, the anti-twist pulley 403 is installed at the position of point A at the vertical conveying section. The anti-twist pulley 403 at the position of point A at the vertical conveying section is restricted by the anti-twist longitudinal guide rail 401 to only slide vertically. Therefore, the pressure of the seedling raising tray 300 acts on the anti-twist longitudinal guide rail 401 through the support connecting rod 701 and the anti-twist pulley 403. The anti-twist longitudinal guide rail 401 restricts the position of point A from changing, so as to ensure that the corresponding chain link at point A of the vertical conveying section does not shake either; similarly, the anti-twist pulley 403 is installed at the position of point B at the vertical conveying section. The anti-twist pulley 403 at the position of point B at the vertical conveying section is restricted by the anti-twist longitudinal guide rail 401 to only slide vertically. Therefore, the pressure of the seedling raising tray 300 acts on the anti-twist longitudinal guide rail 401 through the support connecting rod 701 and the anti-twist pulley 403. The anti-twist longitudinal guide rail 401 restricts the position of point B from changing, so as to ensure that the corresponding chain link at point B of the vertical conveying section does not shake either. Through this pulley installation method at point A and point B, the anti-twist pulleys 403 at point A and point B move vertically along the anti-twist longitudinal guide rail 401, and the outer periphery of the anti-twist pulley 403 is supported on the inner wall of the anti-twist longitudinal guide rail 401. The supporting force provided by the anti-twist longitudinal guide rail 401 can balance the torque of the weight of the seedling raising tray 300 at point C on the conveying chain 202 of the vertical conveying section, and further enables the triangular link frame 700 to form a better triangular stable structure.

[0047] Since the conveying chain 202 of the non-vertical output section is wound around the conveying sprocket 201, the conveying chain 202 of the non-vertical conveying section is supported and will not be deformed under the influence of torque. Therefore, the anti-twist longitudinal guide rail 401 is only provided at the vertical conveying section. In order to ensure that as much as possible the conveying chain 202 of the vertical conveying section can be protected, the top end of the anti-twist longitudinal guide rail 401 is close to the upper conveying sprocket 201, that is, close to the center of the upper conveying sprocket 201, and the bottom end of the anti-twist longitudinal guide rail 401 is close to the lower conveying sprocket 201, that is, close to the center of the lower conveying sprocket 201, so as to increase the length of the anti-twist longitudinal guide rail 401 as much as possible to ensure that the conveying chain 202 of the vertical conveying section does not deform. At the same time, the top end and the bottom end of the anti-twist longitudinal guide rail 401 are provided with openings that are beneficial for the anti-twist pulley 403 to pass through.

[0048] The left and right sides of the two vertical conveying sections of the same conveying chain 202 are respectively provided with anti-twist longitudinal guide rails 401, that is, the same conveying chain 202 is provided with four anti-twist longitudinal guide rails 401, and the two ends of the chain link hinge shaft 402 are respectively installed with anti-twist pulleys 403, and the two anti-twist pulleys 403 are respectively slidably matched with the corresponding two anti-twist longitudinal guide rails 401. Since the anti-twist longitudinal guide rails 401 are provided on both sides of the conveying chain 202, and the anti-twist pulleys 403 on the left and right sides are used for cooperation, the two anti-twist pulleys 403 are restricted by the two anti-twist longitudinal guide rails 401 to achieve the purpose of stably supporting the conveying chain 202, preventing the conveying chain 202 from being torsionally deformed to a large extent, thereby achieving the purpose of stable operation of the conveying chain 202 and improving the stability of transportation.

[0049] The anti-twist longitudinal guide rail 401 is a grooved guide rail, the groove of which faces the corresponding conveying chain 202, and the outer periphery of the anti-twist pulley 403 is supported by sliding on the groove wall of the grooved guide rail. The anti-twist longitudinal guide rail 401 is provided with a mounting hole, and the seedling raising side frame 200 is provided with a vertically arranged mounting hole, and the two are fixedly mounted by bolts.

[0050] Since the tray mounting seat 703 is fixed on the tray hinge shaft 702, when the seedling tray of the seedling raising tray 300 is overloaded, the seedling raising tray 300 as a whole will rotate around the tray hinge shaft 702, and may tip over or have the possibility of tipping over, resulting in poor stability of the seedling raising tray 300 and failure to maintain a horizontal posture. In order to solve this problem, the present application provides a tray anti-tip guide device 500 for allowing the seedling raising tray 300 to maintain a horizontal posture to avoid tipping over. In this embodiment, see Figure 4 , Figure 5 and Figure 6 The tray anti-turnover guide device 500 includes an anti-turnover connecting rod assembly and a constraint guide rail 501 cooperated with the anti-turnover connecting rod assembly. Each of the tray mounting seats 703 on the left and right seedling raising side frames 200 is respectively fixed with an anti-turnover connecting rod assembly. All the anti-turnover connecting rod assemblies close to the seedling raising side frames 200 on the same side are respectively provided with a constraint guide rail 501. During the transportation of the seedling raising tray 300 driven by the conveying chain 202, all the anti-turnover connecting rod assemblies slide along the corresponding constraint guide rail 501 to limit the rotational freedom of the tray mounting seat 703, so that the seedling raising tray 300 maintains a horizontal posture to avoid tipping.

[0051] The constraint guide rails 501 located on the left and right sides are respectively fixed on the corresponding seedling-raising side frames 200. The constraint guide rails 501 on the left and right sides are respectively located on the outer circles of the corresponding conveying chains 202 and are eccentrically arranged with the corresponding conveying chains 202. The constraint guide rails 501 are provided with mounting round holes, and the seedling-raising side frames 200 are provided with vertically arranged mounting long holes. The two are fixedly installed through bolts. The setting of the mounting long holes can be used to adapt and adjust the positions of the constraint guide rails 501.

[0052] The constraint guide rail 501 is a waist-shaped guide rail. The waist-shaped guide rail includes two vertical conveying guide rails. The top and bottom ends of the two vertical conveying guide rails are respectively connected with arc-shaped conveying guide rails through connecting pieces. The connecting pieces are channel-shaped parts used to connect the vertical conveying guide rails and the arc-shaped conveying guide rails, which can make the position of the arc-shaped conveying guide rail change relative to the vertical conveying guide rail. It is used in cooperation with the vertical mounting long holes, so that the constraint guide rail adapts to the change of the guide rail track after the sprocket is tensioned and adjusted. The constraint guide rail 501 is a channel-shaped guide rail, and the outer circumference of the anti-tipping pulley slides and supports on the groove wall of the channel-shaped guide rail.

[0053] See Figure 5 , the anti-tipping link assembly includes a tray anti-tipping link 502. One end of the tray anti-tipping link 502 is fixed on the tray hinge shaft 702 and is fixedly connected to the tray mounting seat 703. The other end of the tray anti-tipping link 502 is installed with an anti-tipping pulley 503. The anti-tipping pulley 503 slides and is limited along the constraint guide rail 501. Define the center of the anti-tipping pulley 503 as point D. Since one end of the tray anti-tipping link 502 is fixedly connected to the tray mounting seat 703, when the tray mounting seat 703 is driven by the conveying chain 202 to move, the tray anti-tipping link 502 cooperates with the specific track of the constraint guide rail 501 through the anti-tipping pulley 503 at point D. When the tray anti-tipping link 502 moves with the tray mounting seat 703, its own angle never changes, thereby restricting the rotational freedom of the tray mounting seat 703 at point C, that is, ensuring the horizontal attitude of the seedling-raising tray 300 and reducing the risk of the seedling-raising tray 300 tipping over.

[0054] The tray mounting seat 703 is horizontally arranged, and the tray anti-turnover link 502 is located at the lower side of the tray mounting seat 703 and is inclined between the two. The tray anti-turnover link 502 is always kept in an inclined state by the restriction of the constraint rail 501, and the anti-turnover pulley 503 is pressed on the groove wall of the constraint rail 501. The constraint rail 501 provides a reaction force to the anti-turnover pulley 503, thereby overcoming the moment of the tray anti-turnover link 502 around point C, so that the tray mounting seat 703 at point C and the seedling raising tray 300 installed on the tray mounting seat 703 always maintain a horizontal posture even during the movement process, thereby reducing the risk of the seedling raising tray 300 tipping over. Preferably, the angle between the tray anti-turnover link 502 and the vertical direction is 45°, at which time the constraint rail 501 will bear the minimum pressure, that is, the device can obtain the best stability effect.

[0055] The restraint guide rails 501 on the left and right sides are staggered in the front-to-back direction, and the tray anti-rollover connecting rods 502 on the left and right sides of the same seedling raising tray 300 are correspondingly tilted forward and backward, that is, one of the tray anti-rollover connecting rods 502 is tilted forward and downward to cooperate with one of the corresponding restraint guide rails 501, and the other tray anti-rollover connecting rod 502 is tilted backward and downward to cooperate with the other corresponding restraint guide rail 501.

[0056] Mechanical analysis of the tray anti-turnover guide device 500:

[0057] The restraining guide rails 501 on the left and right sides are arranged in a staggered manner in the front-to-back direction. Figure 5 ,Will Figure 5 The force points corresponding to the same seedling tray 300 are simplified as point A, point B, point C, point D1 and point D2. Figure 6 A force analysis is performed, wherein point D1 and point D2 are the force points of the anti-turnover guide rails of the tray anti-turnover connecting rod 502 and the corresponding constraint guide rails 501 on the left and right sides of the same seedling raising tray 300;

[0058] When the tray mounting seat 703 at point C moves to any position, and there is a tipping tendency due to the unbalanced loading of the seedling tray, the tipping moment T( Figure 6 The tipping moment T in can be clockwise or counterclockwise. Figure 6 In the force analysis, the counterclockwise direction is taken as an example), and the two components F1' and F2' of the guide rail wall support force F1 and F2 of the constraint guide rail 501 at the two points D1 and D2 in the tangent direction of the circle S need to be balanced by multiplying the torque T' formed by CD1 and CD2 respectively, that is, T = T' = F1'·CD1+F2'·CD2, wherein CD1 = CD2, and since the lengths of the anti-rollover connecting rods 502 of each pallet are the same, they are all replaced by CD, and the support forces F1 and F2 of the guide rail wall on the points D1 and D2 are perpendicular to the instantaneous guidance of the constraint guide rail 501;

[0059] When at any position, the smaller the angle between the vertical direction of the instantaneous guiding of points D1 and D2 of the constraint guide rail 501 and the tangential direction of this point along the circle S, the greater the component forces F1' and F2', that is, the better the stability effect. Conversely, when the required balancing moment T' is constant, the smaller the above-mentioned angle, the smaller the reaction force on the guide rail wall, and the lower the mechanical property requirements for the guide rail.

[0060] Let ∠D1CD2 = 2α, and the angles between the supporting forces F1, F2 and the vertical direction be β, then:

[0061] T' = CD·(F1' + F2') = CD·[F1·sin(β - α) + F2·sin(β + α)]

[0062] Considering the extreme case, when the direction of the supporting force of one of the points D1 and D2 is exactly tangent to the circle S, that is, α = β, then

[0063] T' = CD·(F1' + F2') = CD·[F1·sin(0°) + F2·sin(2α)]

[0064] = CD·F2·sin(2α) (0° ≤ α ≤ 90°)

[0065] That is, F2 = T' / (CD·sin(2α)) (0° ≤ α ≤ 90°)

[0066] Therefore, when α = 45°, F2 can obtain the minimum value.

[0067] To sum up, when the CD rod forms an angle of 45° with the vertical direction, in the extreme case, the guide rail wall of the constraint guide rail 501 will bear the minimum pressure, that is, the device can obtain the best stability effect.

[0068] This device forms a stable four-point conveying mechanism through the four points A, B, C, and D, which consists of a conveying chain, a supporting connecting rod, and a tray anti-tipping connecting rod. This four-point vertical conveying method is the core innovation point of this seedling-raising equipment. Among them, the anti-twist pulley at point AB moves in the vertical anti-twist longitudinal guide rail to balance the torque of the weight of the seedling-raising tray at point C on the conveying chain. The anti-tipping pulley at point D runs in the constraint guide rail with a specific trajectory to ensure the horizontal posture of the seedling-raising tray and overcome the tipping torque of the seedling-raising tray. This four-point conveying method is used to improve the operation stability and reliability of the seedling-raising equipment as a whole.

[0069] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. Four-point conveying mechanism for seedling-raising tray, characterized in that, Including: A seedling raising side frame, on which there are upper and lower arranged conveying sprockets, and a conveying chain is drivingly connected between the upper and lower conveying sprockets. A sprocket driving device is provided on one of the conveying sprockets; A plurality of groups of triangular connecting rod frames are arranged on the outer peripheral circle of the conveying chain, and the plane where the triangular connecting rod frames are located is parallel to the plane where the conveying chain is located; Each group of the triangular connecting rod frames includes two supporting connecting rods. The inner ends of the two supporting connecting rods close to the conveying chain are spaced and hinged on the conveying chain. The outer ends of the two supporting connecting rods far from the conveying chain are correspondingly hinged and connected with a tray hinge shaft, and a tray mounting seat for mounting a seedling raising tray is fixed at one end of the tray hinge shaft; A chain anti-twist guiding device is arranged on the vertical conveying section of the conveying chain between the upper and lower conveying sprockets, and is correspondingly matched with the inner ends of the two supporting connecting rods close to the conveying chain, for restricting the vertical movement of the inner ends of the two supporting connecting rods along the vertical conveying section of the conveying chain to prevent the conveying chain from twisting; The chain anti-twist guiding device includes two vertically arranged anti-twist longitudinal guide rails, and the two anti-twist longitudinal guide rails respectively correspond to the two vertical conveying sections of the same conveying chain. The anti-twist longitudinal guide rails are fixed on the seedling raising side frame. The two supporting connecting rods are hinged to the chain links of the conveying chain through link hinge shafts, and anti-twist pulleys are installed at the outer ends of the link hinge shafts, and the anti-twist pulleys can slide vertically along the corresponding anti-twist longitudinal guide rails; The top of the anti-twist longitudinal guide rail is close to the upper conveying sprocket, and the bottom of the anti-twist longitudinal guide rail is close to the lower conveying sprocket. The top and bottom of the anti-twist longitudinal guide rail are provided with openings conducive to the anti-twist pulley passing through; A tray anti-overturning guiding device includes an anti-overturning connecting rod assembly and a constraint guide rail cooperating with the anti-overturning connecting rod assembly. Each tray mounting seat is correspondingly fixed with an anti-overturning connecting rod assembly, and all the anti-overturning connecting rod assemblies are correspondingly provided with a constraint guide rail. During the process of the seedling raising tray being driven and conveyed by the conveying chain, all the anti-overturning connecting rod assemblies slide along the constraint guide rail to limit the rotational freedom of the tray mounting seat, so that the seedling raising tray maintains a horizontal posture and avoids overturning; The constraint guide rail is fixed on the seedling raising side frame, and the constraint guide rail respectively corresponds to the outer circle of the conveying chain and is eccentrically arranged with respect to the corresponding conveying chain; The constraint guide rail is provided with mounting round holes, and the seedling raising side frame is provided with vertically arranged mounting long holes, and the mounting round holes and the mounting long holes are fixedly installed through bolts; The constraint guide rail is a waist-shaped guide rail, and the waist-shaped guide rail includes two vertical conveying guide rails. Arc-shaped conveying guide rails are respectively arranged at the top and bottom of the two vertical conveying guide rails, and the ends of the vertical conveying guide rails and the arc-shaped conveying guide rails are connected by connecting pieces.

2. The four-point conveying mechanism for the seedling-raising tray according to claim 1, wherein: A sprocket adjusting mechanism is provided between the conveying sprocket located below and the corresponding seedling raising side frame.

3. The four-point conveying mechanism for a seedling tray according to claim 2, characterized in that: The sprocket adjusting mechanism includes a sprocket mounting seat fixed on the seedling raising side frame. A plurality of vertically arranged sprocket adjusting chutes are provided on the sprocket mounting seat. The bearing seat of the conveying sprocket is slidably mounted on the sprocket adjusting chute through an adjusting bolt and an adjusting nut. A fixing block is provided on the sprocket mounting seat, and a sprocket ejector rod is threadedly mounted on the fixing block. A sprocket adjusting block is fixed on the bearing seat, and the bottom end of the sprocket ejector rod abuts against the top end of the sprocket adjusting block.

4. The four-point conveying mechanism for a seedling tray according to claim 1, characterized in that: The structures of multiple groups of the triangular link frames are the same, and the lengths of the two support link rods of the same group of the triangular link frames are the same.

5. The four-point conveying mechanism for the seedling-raising tray according to claim 1, wherein: The anti-overturning link assembly includes a tray anti-overturning link. One end of the tray anti-overturning link is fixedly connected to the tray mounting seat, and an anti-overturning pulley is mounted at the other end of the tray anti-overturning link. The anti-overturning pulley is slidably limited along the constraint guide rail.

6. The four-point conveying mechanism for a seedling raising tray according to claim 5, characterized in that: The tray mounting seat is horizontally arranged, and the tray anti-overturning link is obliquely arranged below the tray mounting seat.

7. The four-point conveying mechanism for the seedling-raising tray according to claim 6, wherein: The included angle between the tray anti-overturning link and the vertical direction is 45°.

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